Becoming aware of your inner self and surroundings is meditation. Upon obeserving, do not become judgemental, but become empty of thoughts. Live in the moment and not dwell on unchangable past or undetermined future. Do not repress, prevent or disturb this nothingness, thoughtlessness, emptiness. You aren't sleeping but only becoming more alert and aware. Take a moment to sit quietly and ponder. Let it all disappear and welcome the state of deep peace. One could enjoy the inner sound of silent as described in Patanjali's pratyahara, dharna or dhyaan; chant mantra, look at a source of light or move prayer beads to search the basic truths of life, to separate reality from illusion itself.